31 Conclusions Basic effects of divertor geometry on target power load confirmed and used in divertor design Divertor geometry can be used effectively to optimise D/T and recycling impurity pumping Neutral compression can be affected by divertor closure but maximum determined by anomalous transport Spatial variation of plasma detachment along divertor target can be influenced by divertor geometry. Global divertor detachment and density limit are not much affected Effect of septum possible seen in JET but over very small range of separatrix-septum distances Effects on divertor geometry on radiation seen in ASDEX Upgrade but not at JET (Te,div P inp?) Effects of divertor geometry on flows, SOL width and impurity shielding very minor if any (beyond increased pumping of recycling impurities) Alberto Loarte 5 th ITPA Divertor and SOL Physics Group CFN IST Lisboa - Portugal

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